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TI-2026-68423 Aliases CVE-2026-105840GHSA-3hwf-cvfh-5874

Path traversal in lrzsz lrz restricted mode lets senders overwrite files

Priority LOW 35CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 3 fixed, 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

lrzsz before 0.13.0 contains a path traversal flaw in the lrz receive utility's restricted mode. The checkpath() function only rejects '../' sequences, so a remote ZMODEM sender can supply absolute pathnames and write files outside the current directory (CWE-22). A remote attacker without privileges can overwrite any file that the receiving user can write.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

lrzsz before 0.13.0 contains a path traversal vulnerability in the lrz receive utility's restricted mode that allows malicious ZMODEM senders to write files outside the current directory using absolute pathnames. Because checkpath() in src/lrz.c only rejects '../' sequences unless built with --enable-pubdir, attackers can send files named with absolute paths to overwrite any file writable by the receiving user.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00313 24th percentileScored 2026-11-07
Fix Partial lrzsz (Uwe Ohse): 0.13.0Red Hat: 3 advisoriesRed Hat: 3 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Uwe Ohselrzszbefore 0.13.00.13.0Patch availableCNA
  • lrzsz VendorUwe Ohse Affected before 0.13.0 Fixed in 0.13.0 Patch available CNA

Remediation

Upgrade lrzsz to version 0.13.0. Red Hat fixes it in Red Hat Enterprise Linux BaseOS 8 (RHSA-2026:83525), BaseOS 9 (RHSA-2026:89755) and BaseOS 10 (RHSA-2026:86056). The sources list no fixed version for Red Hat Enterprise Linux 6, where no fix is planned, or for Red Hat Enterprise Linux 7, where none is available.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA lrzsz (Uwe Ohse) Fixed in 0.13.0

Red Hat 3 advisories

  • RHSA-2026:89755 Released 2026-10-26 · Red Hat rating Important
    lrzsz security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 9) lrzsz-0.12.20-58.el9_8
  • RHSA-2026:86056 Released 2026-10-20 · Red Hat rating Important
    lrzsz security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 10) lrzsz-0.12.20-69.el10_2
  • RHSA-2026:83525 Released 2026-10-15 · Red Hat rating Important
    lrzsz security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 8) lrzsz-0.12.20-46.el8_10

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Uwe Ohse lrzsz — lrzsz 0.13.0 security changes

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-68424 OS command injection in lrzsz lrz pipe modePriority LOW 37
    • TI-2026-68425 Heap buffer overflow in lrzsz lrz when receiving long filenamesPriority LOW 27
    Show all 3 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:86056
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:83525
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:89755

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-105840
  2. 2026-10-06 Alias added: GHSA-3hwf-cvfh-5874
  3. 2026-10-07 Affected versions changed · Red Hat
  4. 2026-10-07 CVSS score added · Red Hat
  5. 2026-10-07 Priority changed: MEDIUM → LOW
  6. 2026-10-09 CISA SSVC decision points changed
  7. 2026-10-16 Fix available: RHSA-2026:83525 · Red Hat
  8. 2026-10-16 Fix available: Red Hat Enterprise Linux BaseOS (v. 8) · Red Hat
  9. 2026-10-21 Fix available: RHSA-2026:86056 · Red Hat
  10. 2026-10-21 Fix available: Red Hat Enterprise Linux BaseOS (v. 10) · Red Hat
  11. 2026-10-26 Fix available: RHSA-2026:89755 · Red Hat
  12. 2026-10-26 Fix available: Red Hat Enterprise Linux BaseOS (v. 9) · Red Hat

References

Advisory 1

Other 1

  • TI-2026-68424 OS command injection in lrzsz lrz pipe mode CVSS 4.0HIGH 7.7
  • TI-2026-68425 Heap buffer overflow in lrzsz lrz when receiving long filenames CVSS 4.0MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences